Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature

A technology of low-temperature sintering and porous ceramics, which is applied in ceramic products, applications, household appliances, etc., to achieve the effects of improving high-temperature mechanical properties, improving oxidation resistance, and good mechanical strength

Active Publication Date: 2016-05-04
JIANGXI UNIV OF SCI & TECH
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this alleviates its further oxidation at high temperature to a certain extent, the SiO 2 The existence of silicon ca

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature
  • Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature
  • Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] First, the Al 2 (SO 4 ) 3 , Na 2 SO 4 And B 2 O 3 The raw materials are mixed with a molar ratio of 1:4:1 / 6. After mixing and ball milling, they are passed through a 120-mesh sieve to obtain the mixture A; then, the mixture A, SiC powder, and carbon powder are in a mass ratio of 8:100 : Mixing with a ratio of 20, after mixing and ball milling, passing through a 120-mesh sieve to obtain Mixture B; using dry pressing method under the pressure of 200Mpa and pressure holding time of 120s to press the above-mentioned Mixture B into a green body; After drying it, it was placed in an electric furnace and heated to 900°C at a heating rate of 5°C / min for calcination. After reaching the calcination temperature, it was kept for 3 hours and then cooled in the furnace; finally, the sample was heated at 80°C Under the conditions, use tap water ultrasonic cleaning, to the Na in the liquid after cleaning + Content does not exceed Na in tap water + Stop cleaning when th...

Example Embodiment

[0027] Example 2:

[0028] First, the Al 2 (SO 4 ) 3 , Na 2 SO 4 And B 2 O 3 The raw materials are mixed with a molar ratio of 1:4:1 / 6. After mixing and ball milling, they are passed through a 120-mesh sieve to obtain mixture A; then, the mixture A, SiC powder, and graphite powder are in a mass ratio of 10:100 : 100% of the ingredients, after mixing ball milling, passing through a 120-mesh sieve to obtain the mixture B; the dry pressing method is used under the pressure of 200Mpa, the pressure holding time is 90s to press the above mixture B into a green body; After drying it, it is placed in an electric furnace and heated to 1000°C at a heating rate of 3°C / min for calcination. After reaching the calcination temperature, it is kept for 5 hours and then cooled in the furnace; finally, the sample is heated at 80°C Under the conditions, use tap water ultrasonic cleaning, to the Na in the liquid after cleaning + Content does not exceed Na in tap water + Stop cleaning when the concent...

Example Embodiment

[0030] Example 3:

[0031] First, the Al 2 (SO 4 ) 3 , Na 2 SO 4 And B 2 O 3 The raw materials are mixed with a molar ratio of 1:4:1 / 6. After mixing and ball milling, they are passed through a 120-mesh sieve to obtain mixture A; then, the mixture A, SiC powder, and graphite powder are in a mass ratio of 2:100 :0 ratio of ingredients, after mixing ball milling, passing through a 120-mesh sieve to obtain mixture B; using dry pressing method under the pressure of 150Mpa, pressure holding time of 60s to press the above-mentioned mixture B into a green body; After drying it, it is placed in an electric furnace and heated to 1200°C at a heating rate of 8°C / min for calcination. After reaching the calcination temperature, it is kept for 5 hours and then cooled in the furnace; finally, the sample is heated at 80°C Under the conditions, use tap water to ultrasonically clean to the Na in the liquid after cleaning + Content does not exceed Na in tap water + Stop cleaning when the concentrati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Bending strengthaaaaaaaaaa
Bulk densityaaaaaaaaaa
Bending strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature. The preparation method comprises the following steps: subjecting Al2(SO4)3, Na2SO4 and B2O3 to mixing and ball milling so as to obtain a mixture A; then subjecting the mixture A, SiC powder and a pore forming agent to mixing and ball milling so as to obtain a mixture B; subjecting the mixture B to compression molding and then carrying out drying and calcining; and successively carrying out ultrasonic cleaning and drying on the calcined sample. The method promotes low-temperature sintering of silicon carbide porous ceramic; the method overcomes defects in usage of the silicon carbide porous ceramic at high temperature in the presence of a high-temperature binder or sintering agent and is favorable for further improving the porosity of the silicon carbide porous ceramic; and more importantly, SiO2 produced on the surface of silicon carbide due to oxidation is converted into a mullite crystal phase through a high temperature reaction, so the high-temperature mechanical properties and antioxidation performance of the silicon carbide porous ceramic are further improved.

Description

technical field [0001] The invention relates to the technical field of preparation of porous ceramics, in particular to a method for preparing low-temperature sintered mullite in-situ reinforced silicon carbide porous ceramics. Background technique [0002] Due to its high porosity, good corrosion resistance and high temperature resistance, excellent thermal conductivity and other advantages, silicon carbide porous ceramics have been widely used in high temperature soot filtration, molten metal removal of impurities, catalyst carriers and other fields in recent years. Over the years, scholars from various countries have carried out a lot of research work on the preparation and modification of silicon carbide porous ceramics, and achieved fruitful results. Nevertheless, SiC porous ceramics currently suffer from two major problems. [0003] On the one hand, how to sinter silicon carbide powder at a lower temperature is a major problem it faces. Since silicon carbide is a str...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/565C04B38/06
CPCC04B35/565C04B38/068C04B2235/3201C04B2235/3217C04B2235/3409C04B2235/448C04B2235/77C04B2235/80C04B2235/96C04B38/067C04B38/0645C04B38/0074C04B38/0067
Inventor 邓义群沈针
Owner JIANGXI UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap